皮皮学,免费搜题
登录
搜题
【简答题】
Passage C Cell phones are a danger on the road in more ways than one. Two new studies show that talking on the phone while traveling, whether you’re driving or on foot, is increasing both pedestrian deaths and those of drivers and passengers, and recommend crackdowns on cell use by both pedestrians and drivers. The new studies, lead-authored by Rutgers University, Newark, Economics Professor Peter D. Loeb, relate the impact of cell phones on accident fatalities to the number of cell phones in use, showing that the current increase in deaths resulting from cell phone use follows a period when cell phones actually helped to reduce pedestrian and traffic fatalities. However, this reduction in fatalities disappeared once the numbers of phones in use reached a “critical mass” of 100million, the study found. These studies looked at cell phone use and motor vehicle accidents from 1975 through 2002, and factored in a number of variables, including vehicle speed, alcohol consumption, seat belt use, and miles driven. The studies found the cell phone-fatality correlation to be true even when including factors such as speed, alcohol consumption, and seat belt use. Loeb and his co-author determined that, at the current time, cell phone use has a “significant adverse effect on pedestrian safety” and that “cell phones and their usage above a critical threshold adds to motor vehicle fatalities.” In the late 1980s and part of the 1990s, before the numbers of phones exploded, cell phone use actually had a “life-saving effect” in pedestrian and traffic accidents, Loeb notes. “Cell-phone users were able to quickly call for medical assistance when involved in an accident. This quick medical response actually reduced the number of traffic deaths for a time,” Loeb hypothesizes. However, this was not the case when cells were first used in the mid-1980s, when they caused a “life-taking effect” among pedestrians, drivers and passengers in vehicles. In those early days, when there were fewer than a million phones, fatalities increased, says Loeb, because drivers and pedestrians probably were still adjusting to the novelty of using them, and there weren’t enough cell phones in use to make a difference in summoning help following an accident, he explains. “The ‘life-saving effect’ occurred as the volume of phones grew into the early 1990s, and increasing numbers of cells were used to call 911following accidents, leading toa drop in fatalities”, explains Loeb. But this life-saving effect was canceled out once the numbers of phones reached a “critical mass” of about 100 million and the “life-taking effect” – increased accidents and fatalities outweighed the benefitsofquickaccessto911services, according to Loeb. Loeb and his co-authors used econometric models to analyze data from a number of government and private studies. He and his co-authors recommend that governments consider more aggressive policies to reduce cell phone use by both drivers and pedestrians, to reduce the number of fatalities.
拍照语音搜题,微信中搜索"皮皮学"使用
参考答案:
参考解析:
知识点:
.
..
皮皮学刷刷变学霸
举一反三
【判断题】EOS是区块链2.0的代表,是一个允许开发者在其协议顶端创建区块链应用(Dapp)的新平台
A.
正确
B.
错误
【单选题】某跨地区经营汇总缴纳企业所得税的企业,总公司设在上海,在天津和深圳分别设有一个分公司,2014年8月共实现应纳税所得额2600万元,假设企业按月预缴企业所得税率为25%,另外,天津分公司2013年度的营业收入、职工薪酬和资产总额分别为420万元、160万元、600万元;深圳分公司2013年度的营业收入、职工薪酬和资产总额分别为1500万元、320万元和1800万元。营业收入、职工薪酬和资产总额的权...
A.
125
B.
150
C.
250
D.
325
【单选题】欲研究某化学反应的反应截面和它与反应速率的关系,应采用下列方法中的 ( )
A.
停止 - 流动法
B.
分子束法
C.
闪光光谱法
D.
碰撞理论计算法
【多选题】在测量仪器中.为了( )应用了各种光学零件,如透镜,棱镜、光楔等
A.
进行光学成像
B.
影像放大
C.
调整成像放大率
D.
改变光线方向
E.
测量微小读数等
【单选题】欲研究某化学反应的反应截面和它与反应速率的关系,应采用下列方法中的()
A.
停止-流动法
B.
分子束法
C.
闪光光谱法
D.
碰撞理论计算法
【单选题】前照灯近光灯丝应位于反射镜的( )
A.
焦点上
B.
焦点的上方
C.
焦点的上前方
D.
焦点的下方
【单选题】男性吸烟率是女性的10倍,该指标为
A.
相对比
B.
流行率
C.
构成比
D.
罹患率
E.
标化流行率
【单选题】一女性患者,28岁,农民,急性腹泻10余次,脓血便伴有黏液,有里急后重感,腹疼,肠鸣音亢进。38.5°C,白细胞升高。粪便常规镜检,脓细胞满视野,红细胞(少许或++),未发现阿米巴原虫,你认为患者最大可能是( )
A.
伤寒
B.
食物中毒
C.
毒血症
D.
脓毒血症
【单选题】一女性患者,28岁,农民,急性腹泻2天,每天腹泻10余次,脓血便伴有粘液,有里急后重感,腹痛,肠鸣音亢进。体温38·5°C,白细胞升高。粪便常规镜检,脓细胞满视野,红细胞(少许或++),未发现阿米巴原虫,你认为患者最大可能是
A.
伤寒
B.
胃肠型流行性感冒
C.
食物中毒
D.
急性细菌性痢疾
【单选题】问题:下列关于画笔工具(Brush Tool)的描述哪个是正确的?
A.
画笔工具绘出的一定是可编辑的封闭路径
B.
画笔工具绘出的是可编辑的路径
C.
画笔工具绘出的路径上锚点的数量是固定的
D.
画笔工具绘出的路径上的锚点都是直线点
相关题目: